Become more status conscious. You are most likely inadvertently saying things that sound like status moves, which prompts others to not take what you say at face value. I haven't figured out how to fix this completely, but I have gotten better at noticing it and sometimes preempting it.
r/Fitness does a weekly "Moronic Monday", a judgment-free thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. I thought this seemed like a useful thing to have here - after all, the concepts discussed on LessWrong are probably at least a little harder to grasp than those of weightlifting. Plus, I have a few stupid questions of my own, so it doesn't seem unreasonable that other people might as well.