What you're saying is true, that not knowing how to pronounce aloud a word you've only ever read is not some kind of 100% surefire sign you're a bigot or anything like that.
It just means, as you say, that you've never heard it said aloud.
But... that also means you never bothered to look up how it is pronounced (its on wikipedia, the actual Godot devs have videos of them saying it, etc)... and it does also mean you presumably are also unfamiliar with Waiting for Godot.
So I would say you are also 'uncultured' in that way, but of course, simply being uncultured doesn't make one a bigot.
You could just not have the time, money, etc, to have seen the play before.
That by no means say anything else really concrete about you, or any other person, if that's like... the only single datapoint you know about them.
In all seriousness, I do strongly recommend seeing the actual play, probably you could find a dramatic reading / radio drama version of it somewhere on the net, or even a full video captured performance of it on a forgotten youtube channel or the Internet Archive.
I... don't know that its ever been adapted as a proper movie, perhaps a film snob can appear and call me uncultured, haja!