Sasuke acquires an “us versus them” mentality at one point, an “Uchiha versus Konoha” mindset, as seen when Sasuke describes the people of Konoha, even the members of Team 7, as “outsiders”, which automatically infers that the Uchiha clan are “insiders”, those that share a connection to Sasuke that no one else does, evidently not even Naruto and Sakura slip into that during Shippuden (until later when Sasuke accepts those two as his family at the end of the series). Sasuke and the Uchiha clan share in something that no “outsider” could touch, at least in Sasuke’s mind. And it’s not even a subtly subconscious segregation in Sasuke’s mind – he bluntly refers to Naruto and the rest of Konoha as “outsiders”.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sasuke comments that Konoha was “cackling like fools” in the wake of the massacre of his nakama, showing that part of Sasuke resented Konoha for being so carefree and happy, unbothered by the Uchiha's annihilation. One can't ignore that Itachi murdered a great portion of Konoha's shinobi and walked free without being held to justice for his crime, and in general Konoha appeared unbothered by a mass-murderer getting away with his crimes without any punishment whatsoever. No doubt young Sasuke was frustrated and felt utterly alone when his world was savagely torn to shreds and he entered a long-term period of grieving alone. Meanwhile everyone else in the village appeared virtually unaffected by the demise of the Uchiha clan. It appears Sasuke's clanmates had about as much connection to the village outside the compound as Sasuke did, seeing as how Konoha had an “oh no, that's too bad” reaction to the Uchiha Massacre, yet didn't seem super sad about the wanton destruction of their fellow villagers, at least not as upset as one might expect when they'd brutally lost many of their fellow villagers and comrades, including children.

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Sasuke’s hurt led to him feeling cut off from the rest of the village, even feeling that Konoha doesn’t even feel sympathy for the tragedy of his fallen comrades. Sasuke is furious at the discrimination and scorn he feels his clan faced, and it’s made him feel like he and his entire people group are isolated and cut off from Konoha, a village that Sasuke judges to be completely uncaring about the Uchiha people. Scratch that – Sasuke believes that the villagers of Konoha actively wanted the Uchiha gone (which in Danzo’s case, was true).

 

It's unsurprising that Sasuke actively began to view his clan as separate from Konoha after learning the truth behind Itachi's actions, believing the Leaf scorned the Uchiha. Sasuke had probably long perceived the Uchiha and Konoha as almost separate entities, seeing as how so many people singled him out for being an Uchiha. Because the Uchiha were systematically oppressed, discriminated against, treated with open and hostile distrust, and finally exterminated by their own village, it's not surprising that someone as emotionally distraught as Sasuke was would jump to the conclusion that Konoha scorned the Uchiha. 

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Of course, Sasuke gets delusional. Aside from over-victimizing his clan and blaming all the citizens of Konoha, most of whom were innocent and ignorant of the Uchiha’s plight, Sasuke begins acting like his clan is better than everyone else, likely a by-product of how deeply he treasures his clan.

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Sasuke referring to Itachi as “perfect” may partially reflect his feelings towards the rest of his clan as well.

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To Sasuke, his clan was a beautiful treasure that should be protected, and he recalls his clan life with a rosy hue, envisioning his childhood as perfect. Thus why he is so adamant about restoring his clan's honor and reputation, which had been destroyed as people quickly forgot the good citizens of the Uchiha clan and only remembered the bad apples of the clan (unironically both in-universe and among the fanbase the Uchiha are indiscriminately negatively stereotyped because the good Uchiha can never escape the shadow of their villainous clanmates). In a crazed state of mind, Sasuke speaks of purifying his clan from the rotting world about him, showing how much Sasuke is disgusted and disillusioned with the cruel reality he is mired in. Sasuke acts as if even the mere memory of his clan is too pure and beautiful for others to have. If they hate the Uchiha clan so much, then Sasuke will erase even the memory of the Uchiha clan by killing all those Leaf villagers who he believed scorned the Uchiha.