I don't know why, but despite I understand, on a fundamental level, that it's not important things, people houseruling things out of their campaign for wrong reasons annoy me to the point I have to fight in order not to tell them they are wrong. Recently I talked with another DM about which rule we didn't use/ban from the game. We were talking about DnD 3.5.

>Since he doesn't ask players to confirm critical strike, you can't take bonus augmenting your critical zone with weapon with "too big" critical zone (ie 18-20 or greater), are banned. However, for the scythe it's still alloweed, despite it being statistically similar to the banned weapon.
>Psionics are "too powerful, so broken". But the table has 3 mages or other top tier spellcaster.
>He doesn't like some random class because they can do one thing that seems powerful, like the duskblade for example, or the assassin (???)
>I forgot the name but he also ban the feat that allow you to make more than one attack during the enemy turn if he triggers it.

It's not that he houserules them out that annoys me, it's the reason he does it.