Why do my S/O friends tease him about me? Is it a bad thing?

DermalPunch
I'm with a much younger guy which has it's advantages and disadvantages. I was on a video call with him when he was at the barbershop waiting to get a haircut. After we hung up the video call, he sent a pic of his barber friend saying he was pissing him off.

Apparently, his friend was repating every word my S/O was saying to me on the video call.

Why would they be making fun of him for talking to me?
Why do my S/O friends tease him about me? Is it a bad thing?
Why do my S/O friends tease him about me? Is it a bad thing?
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