Earlier quoted context omitted.
If you consider reddit to be hardcore-leftist, you'll find plenty of like-minded people on 4chan.
Try saying something patriotic on reddit and see how fast you will get downvoted to hell.
Also, my anecdotal experience is very different than yours: not a day goes by without me reading some imbecilic comment about american exceptionalism, and where other idiots (I think you'd call them "patriots") gather to upvote/outbid said comment, particularly on large subs.