If you are thinking now about analogies with "white privilege" as discussed by Robin DiAngelo or microaggressions, there might be something to dig into, but I think the equivalents are elsewhere than language that just uses the word blind.

Well the use of blindspot isn't ableist. Your blindspot while driving a car describes a area that is out of your line of vision and cannot be seen, you are blind to it. However, if you are concerned with the use of the word, here are some synonyms you may try.

defect, deficiency, drawback, error, failure, fault, flaw.

You could simply use the term Gap or gap in experience if you really wanna play it safe. Personally the term blindspot never bothered me however I don’t represent everyone.

Well... I guess, if nothing else, you've *seen* the spectrum from end to end regarding these ideologies.

So, although I guess I could have been more respectful, you get my point, right?

Tell your friend we're all offended that they think they have a right to be offended in our behalf.

I'm kidding, of course. Given the context, it's reasonable that they would raise the issue (not necessarily making a big deal of of it though) and it's reasonable of you to ask about it.