What is the worst or the most disrespectful chess opening ever existed?

I think what you're looking for is the Bongcloud, named after the great chess theoretician Lenny Bongcloud: https://www.chess.com/member/lenny_bongcloud

Even Garry Kasparov has never beaten the Bongcloud in a rated game, though he did scrape a win in a casual online game:

Note that Kasparov is playing against the Sicilian Bongcloud here as opposed to the pure Bongcloud which would go 1. e4 e5 2. Ke2 , but similar ideas are common to both.

There is no such opening.

What does exist is people who get offended by anything.

The thing that annoys me the most is when someone plays the London System

one of the most boring and tedious systems out there.

But if they play 1. f3, 1. a4, or the Bongcloud, then wonderful

thanks for the advantage on move 1.

Maybe their idea is to beat me psychologically, but I’m not going to take it badly or feel intimidated.

These.

The Bongcloud

The Double Bongcloud

The Wrongcloud

Crab opening

Mega bongcloud

I tried it on my friend but he forced my king back to it's square so I couldn't switch positions with the queen

Even gave him a free knight

LOL,both the Creepy-Crawly and the Crab Openings are troll-bait openings

Andersen than e4 than bongcloud

The worst is the Jobava Attack by amateurs because they are clueless and don't understand what they are doing!

Amateurs play it like Robots and play 1.d4, 2.Nc3, and 3.Bf4 against everything, not enemies knowing the point behind the moves. They have the same problem with the Barry, Veresov, etc.

After 1.d4, if Black plays 1...d5 or 1...Nf6, that is to stop 2.e4. White plays 2.Nc3. Why? To play the Jobava? No! To play e4! Now if 2...d5 or 2...Nf6 (whichever Black did not do move 1), ONLY NOW 3.Bf4. The ...d5 push by Black weakens the b8-h2 diagonal. If the Black pawn is still on d7 or d6, there is no c7-attack.

I have seen the following played over the board, the first of which with me as Black:

1.d4 e6 2.Nc3 Bb4 3.Bf4 - What is the point of either move? 2.Nc3 is to play e4, why not play 2.e4 then? Otherwise, White should play c4 or Nf3. 2.Nc3 is useless as it's main point is already available to White. After 2.Nc3 Bb4, the only move that keeps an advantage for White is 3.e4. 3.Bf4 Nf6 is already zeroes and maybe even slightly worse. The d-pawn has not committed itself either. Go ...d6 and now the Bishop bites on granite and the knight is pinned. Totally pointless.

1.d4 Nf6 2.Nc3 d6 3.Bf4 - again, what is the point? The purpose for 2.Nc3 is to play 3.e4 and if it is stopped by 2...d5, only now with the weakened diagonal do you play 3.Bf4. Here White should play 3.e4!

1.d4 Nf6 2.Nc3 g6 3.Bf4 - again, 3...d6 and now what? The "Threat" was to play e4. Black ignored it. Now play it rather than the ridiculous 3.Bf4.

The Jobava is like the Stonewall Dutch. It should be a last resort. After 1.d4 f5 2.c4 e6 3.Nc3 Nf6 4.Nf3 or 4.Bf4, the move 4...d5 is a blunder. 4...b6 against 4.Bf4 and 4...Bb4 against 4.Nf3. The Stonewall is a last resort when White takes the diagonal first with g3 and Bg2. The Jobava is the same. It is a last resort for when e4 is prevented, which in turn, outside of the Dutch, it requires Black to weaken the b8-h2 diagonal with ...d7-d5.

The Jobava Attack, when used properly, is not "the worst opening" at all, but the Jobava Attack in robotic form is a TERRIBLE opening as it proves you don't understand it. All you know is the one trick pony on c7 and don't actually UNDERSTAND the point and nuances behind it.