Is it weird for a guy to make sexual jokes and innuendos towards his best friends girlfriend?

For the past couple months, my boyfriend’s best friend has been making consistent sexual jokes about me or to me. This ONLY started after he met me in person and when we did meet, we didn’t even get the chance to speak and he was very shy and avoidant of me, so we’re technically still strangers. I don't know why he all of a sudden switched up his behavior but is this weird? Or are the sexual jokes just a guy thing? For context: my boyfriend has known this guy for about a year and a half and there were no sexual jokes about me before, I met him around 6 months ago and the jokes haven’t really stopped since then.

Is it weird for a guy to make sexual jokes and innuendos towards his best friends girlfriend?
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