She is not targeting a person, the person is just the catalyst.
This is why I am in favour of clear rules and guidelines for single sex spaces and sports before a male person tries to muscle his way in. Because then that person can argue he is being bullied and targeted.
And then the next man can claim being a transwoman and argue if the previous person was let in, he should be let in.
And then the convicted sex offender just out of jail can argue the same thing.
I get this feels personal, but if this person has a toilet in their office, they have facilities to use so this doesn't impact them. So why feel targeted if it doesn't impact you? Unless you were planning in using them to make your point you can and women can't object?