How do you deal with unsolicited advice at the gym?

Anonymous
I'm a certified personal trainer and my fiancé is a physiotherapist, so I know what good form is, and what exercises work for me personally. Yet every time I go to the gym, random guys (with terrible form) come up to me to give me "advice". Even if they were right, and I was things wrong, why do they think it's okay to correct people who didn't ask them for their opinion? I don't know how to deal with these people anymore. I tried to be nice, but it doesn't work. I tried putting my headphones back and ignore them, it didn't work either. So how do you deal with unsolicited advice at the gym?
How do you deal with unsolicited advice at the gym?
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