Is the word butthead offensive?

I sometime use the word playfully for the guy "friends". I've had two guys get offended by it.

One was a guy I dated a few years ago. He got really mad and we broke up.

Today I called my current boy a butthead. He just said "I don't like it very much".

Is the word butthead offensive or are they little girlie men?
Is the word butthead offensive?
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