How to decline unsolicited lessons politely?

I play okay , definitely room for improvement but I love playing. But something that has put me off playing with strangers is when they think they can give me unsolicited lessons on course. So my question is what ways have you guys found to deal with people who give you tips and lessons you didn’t ask for?

(P.s if someone is notably better than me , I’ll ask for advice if I’m struggling or interested but I’d never just give a random person lessons if they didn’t ask)