You’re not helping your case when you say that a mistake in common courtesy could lead to suicide.
It is not the burden of anyone to cater to a stranger's mental illness. If you look vaguely male, I will say "excuse me sir, could I get past you?" (and "madam" for a vaguely female looking person). And there is no place where that should be illegal or morally wrong.
Deliberate misgendering is definitely a separate discussion from a genuine mistake.
Additionally, the idea that the incredibly high suicide rate is because of oppression doesn’t match up with other data at all. If this is true, why do whites commit suicide at 3 times the rate of blacks?