Weird middle-aged unc keeps staring at me at the gym

This 40-something year old unc keeps sexually staring at me at the gym. Dude is lowkey eye-fucking me every time I'm there. He tries to mask it by looking at girls in between but i can tell he's not 100% straight.

Caught him adjusting his boner after I was done with my OHP the other day. Watch him come up with some bullshit excuse to "grab beers and play with meat like homies"

What do i do?

6" x 6"... maybe 7x7 when derek finally drops a video