It's a dog whistle. It is exactly the same as if I were to say to you, "all lives matter" or "make America great again".

PS: we know you know this.

It should be safe. Still it seems some people get offended by it. What kind of people? I can only assume they are people more supportive of autocratic regimes than the rest of us.

The exact phrases in question are:

1. Black lives matter.

2. Trans rights are human rights.

3. No nazi bullsh*t.

Phrases 1 & 2 are well-recognized political slogans, and I don't like some of the organizations that have very vocally rallied behind these slogans.

Do you think that makes me a nazi? And if not, how welcome do you think this makes me feel?

You seem to be applying some kind of modus ponens rule to this list. To me, they read disjointly; you can agree with the status quo regarding police violence, and that trans people should not be welcomed in society, and still not follow Nazi ideology.

Respectfully, you’re dodging part of the question.

How would you feel if my org stated “all lives matter” and pretended not to see the problem?

Only if you take it literally which you would only do if you were entirely ignorant of American politics or deliberately hiding behind this interpretation to pretend you aren’t actually taking about a broad % of the population

This rhetorical tactic has a name: https://en.wikipedia.org/wiki/Motte-and-bailey_fallacy