The person you're responding was clearly just saying that it's funny how uncomfortable people were about being recorded by Google Glass, while covert methods of recording are not difficult but rarely worried about.
Take it easy - we know what was meant. No need to get pedantic about the definition of "irony."
But it's not the "thing we know about and can avoid" it's the thing we know about, and wish to push back on so that social norms don't change to find innocuous.
Take it easy - we know what was meant. No need to get pedantic about the definition of "irony."