In an interview with the Willamette Weekly, Portland Trail Blazers center Robin Lopez pointed out which mascot he haes the most. It's the Toronto Raptor. 

In a recent game in Detroit, you wrestled Hooper, the Pistons’ mascot, to the ground.

I was protecting myself. That was self-defense.

Which is the NBA’s most annoying mascot?

The Toronto Raptor. I wish we could go back to Toronto, because he gets my goat. I have a few choice words for that guy.

Can you elaborate on that?

No. He knows.

via Interview: Trail Blazer Robin Lopez on Comic Books and Disney.

Earlier this year, Lopez smacked around Hooper. 

Of course, if you want to talk about the actual worst mascot:

This is the scariest mascot ever. (USATSI)
This is the scariest mascot ever. (USATSI)

But maybe annoying is the wrong word there. After all, when I think "may sneak into your house and murder you in your sleep," I don't think annoying. What's doubly amazing is Lopez dislikes the Raptor, despite him being a replacement after the first one tore his Achilles. Harsh, bro. 

HT: Raptors Republic