Why do guys think I'm rude for not doing something I'm uncomfortable with?

Whenever a guy tells me to do something I always say, "sorry i don't feel comfortable in doing that" or "sorry I'm too shy to do that" or simply I just ignore them to show I'm not interested in doing that. Or when I respond hours because I am busy. Am I the rude one? I just want to understand if I'm the problem or not. Please don't feel attacked..
Why do guys think I'm rude for not doing something I'm uncomfortable with?
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