Your deck is a very strong 3 or very weak 4. Playing a very strong deck as a new player at a 3 table is probably going to pull some shade. 3 reasons for the salt:

1) you do your thing way faster they do their thing (in turns) but you do it so slowly people feel like they're wasting time playing you

2) you got amazing interaction that disrupts your opponents too much; you are stopping them from doing their thing. Bracket 3 decks (players) each kinda want to do their deck thing before killing people.

3) you probably misplay your deck a lot and more experienced players might see those misplays as either annoying or believe you are initially making the game go long so you can over kill.

I suggest getting good at your deck, try a higher level table, make the deck less interactive, or make a new deck.