Steve thinks that people not being able to pick up Mjolnir is a little joke the team and associated SHIELD agents play, and he plays along every once in a while himself.
It’s a silly joke, though. It’s just a hammer. Anyone can pick it up.
I just can’t with Sleipnir. Like what the actual fuck, Norse mythology?
Also, Odin rode into Jotunheim on Sleipnir. Which means at some point before the Thor movie, Loki had an eight legged horse child. And no one talks about it. That shit is normal. No one mentions the fact that Odin’s riding into the Frost Giant’s home planet on his grandson.