God, if it didn't happen again last weekend! I'm at Cabelas' buying some cleaning supplies. A much older guy, luckily a customer, in his late '70's, sees me picking out some nylon brushes I needed and he just rudely interrupts my friend talking to me and proceeded to tell me, don't buy them, I don't know how to clean a gun and I'll ruin my barrels! I asked him, how in the hell this can happen and he told me he knew better than me from shooting for decades. Told him I've now been shooting for 50+ years, know what I'm doing and he was wrong. He really starts ranting again about how I am stupid and don't know anything, so I put my 3xl hand right in front of his face and say stop!, unless you can show me right now your degree in Metallurgy, shut the F#%k up and go away! Finally dawns on him that he is literally in my shadow as I am the size of an NFL linebacker so he turns around, starts mumbling and walks away.
I kid you not, I am a magnet for this, as I have had it happen more times to me, at places ranging from Wally World, to real gun stores and at ranges, than I can believe!