Abaya, don't take this personally please, but I think you're confusing "nutjob" or "crackpot" and "hippie". I don't mean any offense to your family, but your uncle isn't a hippie.
Generally "hippie" has peaceful connotations, usually peaceful to the extreme. That may mean pacificism or just a laid back attitude, but your uncle strikes me as far too aggressive for hippieness.
The negativity around hippies, in my opinion and experience, arises from their dismissiveness about confrontations and their rejection that confrontation can be a useful tool.
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"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." - B. Franklin
"There ought to be limits to freedom." - George W. Bush
"We have met the enemy and he is us." - Pogo
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