I think it used to be more acceptable. For example, 5 years ago I would go out in public with leggings and a tank top or a sweatshirt and feel totally ok with it and loads of other girls were doing the same thing. I think it was actually a trend?
But now, I think it’s a little out dated. I would never do it nowadays, unless I was wearing a long top/hoodie that covered my bum. I think wearing them as straight up pants today isn’t that acceptable. I rarely see anyone wearing leggings as pants anymore.
But if you’re comfortable and confident enough, who cares what other people think or do.
Also if you are wearing leggings as workout clothes it looks completely normal