Player constantly abusing social rules at LGS. How would you act?

Bit of a rant but...

I feel like one player that is at every LGS EDH event is abusing social rules. Said player usually has problem with others playing any combo,strong engines and sometimes proxies but also sometimes expensive cards. As he is always vocal how not cool playing any combo is, LGS started powering down their decks since you have chance to play at his table every time you go to LGS.

Said player usually avoids playing against me since my decks interact a bunch and are ,,unfair,, to him but every now and then due to lack of players we will have to play together. Sometimes he will try to distance myself from his table or mock me because i play cEDH sometimes. Last event we played 2 games in table of 5 and they went like this:

Game 1:

Im having fun either way since i love to joke around while im playing with other players. We all assumed we are going to chill and play something to have that expirience. Game was fun but said player that always complains about other winning with combos and prohibits other to play decks including combos won around turn 6 via infinite mana and [[Urza, Lord High Artificer]].

I had [[kenrith transformation]] in hand but assumed he only plays Urza to gain some value from artifacts at casual table so i decided to put blockers just so i dont die to other players.

Combo happened, i didnt mind that much him winning with it, it just felt little hypocritical. He claims he said his deck contains combo even though noone at table heard him said that.

Game 2:

I decided to pull out deck that can match turn 6 wins, it is my favorite deck helmed by [[Meren of Clan Nel Toth]]. Said player starts telling others how strong that deck is. He changes his deck and tells me next sentence verbatim:

,,I am playing a precon,, and pulls [[Hakbal of the Surging Soul]] which indeed has precon deck.

I decided to change my deck to one of my weakest decks only because i assumed it would be unfair if i played anything else agains precon.

Turn 3 he plays [[Harbinger of the Seas]], a stax card from MH3 that locked some other casual players. I pointed to others that he was obviously lying about his deck being a precon. I removed it for other players instantly so they can play the game and i made it so he couldnt have boardstate for the rest of the game. Others had fun.

Im now not even sure how to approach this behaviour. This is to me obviously abusing social rules and i think its very bad. Should i just automatically pull something like Meren each time he is at table? Obviously i wouldnt trust him on his word anymore and he is kinda unavoidable at LGS.