I've seen people refer to using C and Windows almost as if even mentioning them were a type of blasphemy.

About Windows ... if you have to ask, you ain't ever going to get to know ... =) I dislike using Windows in large part because (the versions I've used) are technically inferior (read: crash way too often) and I find the ethics of the people who have made the most profit off of it questionable (keyword: DOJ). But let's leave that aside, if you want to find anti-Windows / Microsoft sentiment, Perlmonks is hardly a seething hotbed of it.

As for this apparent bias against C, I'd like to see examples. I've been here a fair while, and I have no impression of any bias against C. Your average monk is sane enough and wouldn't (e.g.) seriously recommend coding an OS in Perl. But for a lot of jobs, Perl will do them well, and is generally easier to maintain than (say) equivalent C code. Where utmost speed is necessary, go ahead and use C.

My suspicion is that everywhere you've seen distaste for C, the poster in question was either expressing distaste for using it where it's not well-suited (writing a C routine to grab a web page), or joking. In fact, I don't think I've ever seen a serious anti-C claim made *ever* on this site.