See, I think it's a mistake to decide to start defining people based on how you see their beliefs. Those same people who might not go along with considerations of political correctness may also be in support of issues that are most definitely leftist. Welfare, gay rights, reproductive rights, rejection of religious taboo, environmental conservation, shifting more of the tax burden onto the rich, single payer health-care even. It's certainly true that politics in the US is more complex than simply left and right, but you can point to specific issues that tend to be more popular with one side or the other. Bernie Sanders doesn't stop being further to the left than Hilary Clinton simply because he acknowledges the importance of gun rights.

At any rate, I'd say the simplest way of determining whether a group is on the left or the right is to take some surveys. Those surveys have in the past shown that reddit is to the left of the US in general. Maybe not to the left of some areas of Europe, but by the standards of the US it's typically been pretty leftist. Maybe it'd be better to ask a series of questions of each individual regarding a bunch of different policies and beliefs and use that to chart where they're at, but to judge people's position on the political spectrum between liberal and conservative based solely on one issue or another is going to mislead you.

Especially when it's something as controversial as feminism. A couple years back a poll by Yougov and the Huffington Post showed 82% of respondents saying they believed that people should be treated equally regardless of gender and only 20% of respondents saying they considered themselves feminist. Clearly there's a sizable portion of the population that believes in gender equality but has some criticism of some sort of feminism. All of those people probably aren't secretly conservatives.

It's also important to note that supporting a cause doesn't necessarily mean that you want that topic to be treated with kid gloves. You can be supportive of something and still think that jokes about it are funny or that humorless people are taking advantage of that situation to promote their stick in the mud attitude. Like you said, there's a lot more nuance to it than just left/right.

Edit: j4d3 if PC meant "respect" I'd say something entirely different. It's cowardly enough to construct a strawman, are you really going to build it in response to someone who you have blocked?