A few things about this:
1) And I tell people this all the time, especially homebrewers that come in and think that just because I’m a ‘pro’ I know more than them- JUST BECAUSE YOU’RE A PRO DOESN’T MEAN YOU MAKE GOOD BEER
2) ANYONE, yes ANYONE can become a ‘pro’ brewer. All it takes is money to open a brewery and buy equipment. My lovely wife who knows nothing about beer could open a brewery tomorrow and start making beer and be a ‘pro’
3) many PROS in the industry feel they have NOTHING to learn from us Homebrewers that are ‘below’ them. To me it’s a very dangerous mindset. AND, this is despite evidence based info.
If I found out our bar staff was treating patrons like this I would be effing pissed like no other. Sure I’ve been in the business long enough now to see how some of us will imbibe a little too much and swear you’d ‘buy like 2-3 beers’ if I just made that ‘sour imperial red ale made with lactose, infused with coffee and elderberries and aged in bourbon barrels.’ I get not everyone understands that we need to sell more than 2-3 of those beers. But you treat people with kindness and realize in their mind they’re being helpful.