Here is a question for you.
What if instead of the situation that you were in, the opposite happened to a young developers.
Ie, the employer used a euphemism to discriminate against someone because they were too young.
Would this bother you?
Or is it only your age group that you care about being discriminated against?
TBH, young people are massively discriminated against, in all forms of jobs. It is merely accepted, though.
When you treat people equally, the group in power may feel like they are being discriminated against, because they no longer have an advantage.