I agree in theory, but on the other hand it's normal diplomatic procedure to keep quiet on an ally's domestic affairs. E.g., there wasn't much foreign comment on the abortion laws in Ireland, despite the law being very backward (in my view) until recently. Abortion is also mostly a state law issue in the US rather than a national issue, so you'd have to make clear that you're pushing back at Alabama or whatever rather than NY, where the law is slightly more liberal than in the UK. It's awkward for a foreign leader to thread that needle.
Where I would like to see the UK push back is on stupidity like annexing Greenland and other behavior that threatens or unsettles our allies. Even if it's only "trolling" it damages the western alliance and that's absolutely the UK's business.