Is being polite a weakness?

Okay so, I’ve always been a serious person and not that polite to people, because I think most of the time when you treat people with kindness they look down at you, and when I have a “not friendly face” people seem to respect me more, but the thing is I don’t have many friends, so I started treated people with kindness and politeness and I realized that some people appreciated and is more easy to make friends and for people to come and socialize with you, but yeah there’s gonna be some people that see kindness as a weakness, but as soon as I start noticing they are not reciprocating my kindness I quickly become trashy and always put them in their place. What do you guys think? Any experiences being nice or rude?
Is being polite a weakness?
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