I agree.  I'm also irked by the apparent belief on the part of some creators (especially the people in charge of DC's animated content) that just throwing in some foul language or a sexual reference makes the content "mature."  

Which only serves to come off as less mature. 

I may be another one of those old curmudgeons, but I generally don't like my superheroes swearing. "Damn", "hell", or "ass", sure, but I don't think they need to casually say "shit", or call each other dicks, or tell anyone to go fuck themselves. I'm not exactly a prude. I've said some outlandishly profane things...but also realize there's a time and place for that. I don't think superhero fare is it. 

The same goes for extreme violence. The genre is violence-based, really no escaping that. But fist fights and energy blasts are one thing. We don't need graphic, bloody stabbings and decapitations. I get it: Wolverine's gonna stab some guys. But it doesn't have to be in their necks and heads.  On camera. In great detail. It doesn't make me think, "Wow. This is so sophisticated!" No. It's just gratuitous. 

That said, the Deadpool movies made me laugh. Maybe because I didn't grow up with that character, and/or because they certainly aren't trying to be "mature" with it -- far from it. The cursing and violence is so over the top, it just can't be taken seriously, and they lean into that. 

But that's Deadpool. Not Iron Man. Not Batman. Not Spider-Man. Not Thor. Not Captain America (all of whom have said "shit" at least once in films over the last 15 years).

I can do without casual profanity in superhero comics. Heck, I'm even okay with something like "To Hades with you!" as opposed to "Go to Hell!"

Sure, it may be less "realistic," but the great Stan Lee wrote teenagers who spoke like teenagers without really talking like real teenagers.