But the point is, they’re not in the same environment, unless you consider the internet or Instagram an environment. Even if you think Dave’s comments amount to harassment, he’s not located at her rink; he’s not her coach; he’s not her boss. So it’s unlikely to be something Safesport would deal with - they don’t have any jurisdiction over him, that is, they don’t have the power to investigate or discipline him, anymore than they would have the power to investigate or discipline you, if you regularly said nasty things about Ashley on Twitter, for example.
If you look at stuff people say on Instagram, Twitter, this forum, YouTube, Reddit, etc - you can find a lot of gratuitous nastiness - much worse than the stuff at issue here - and the comments certainly aren’t confined to skaters. But in the US, and in most other countries to a greater or lesser degree - people have the right to free speech, to say what they want, except in certain well-defined circumstances. And I kind of doubt that the comments you take issue with here would rise to that level in the US, or would violate Instagram’s rules. JMO.