I can't tell which are worse - coffee snobs or wine snobs?
Seriously - there are many reasons why people may elect to drink instant; speed, convenience, the flavoured options... indeed, there are some that prefer it to an espresso, cold brew or whatever other method is in vogue at the moment.
If you're into your "real" coffee, that's cool - no-one's stopping you. But is there really a need to try to prove your class (in its multiple meanings) by knocking others' tastes?
Another reason, of course, is that they do not like coffee...!
A fair call - if coffee's not their cup of tea then...
Anyway, I'm a wine snob and a coffee snob and a food snob, somewhat of a whisky snob though that's moderated by the fact that there's probably no such thing as a bad whisky. I suspect I'm probably a movie snob, book snob. If I smoked, it'd be premium quality coffin nails or Cuban cigars - not Winfield or Holiday.
There's seldom a valid excuse for instant coffee - in my opinion of course. However in the scale of crimes against decency and taste, it's a relatively minor transgression, compared to most of the food and drink items listed in the "great products which have disappeared" thread.
No such thing as bad whisky? You've never had Bells then....