Are jeans undignified or disrespectful?

It doesn't really matter, regardless of whether or not we agree with the rules, jeans are clearly prohibited in the tournament:

    4.10.1.3. No players with t-shirts, jeans, shorts,
    sneakers, baseball caps or inappropriate dress are allowed
    in the playing area. Any requests to wear national or
    traditional dress shall be approved by FIDE Supervisor.

Reference: https://www.fide.com/docs/regulations/wrbc_regulations_2024_...

Having bad rules written down doesn't make them immune to criticism. It's a silly unnecessary rule that shouldn't exist, and while Carlsen doesn't deserve any special treatment, being consistent in enforcing a bad rule isn't better than not having the rule in the first place.

Times have changed. Offices used to be full of people in full suits, with trousers. Now it is common for CEOs to wear jeans, and offices are much more tailored to working comfortably, rather than having a "posh" facade.

> More generally, appearances are important because they are clear signs of attention and care.

Attention and care for appearances, not for the job to be done.

One could interpret it that the sharp looks are there as a cover for ... less than stellar competence.

You cannot win with statements like that.

i dont think people who wear jeans should be considered as undignified or unworthy of respect.

its kinda cruel that you think homeless people who have maybe less than jeans should be given no respect, because they dont have a suit