God hates Fa... fast casual Italian restaurant patrons?

So, the thing where "Christian" couples stiff their gay servers, out of disapproval of their "lifestyle."* Dislike, but also, some questions:

1) In the context of eating a meal at a fast casual restaurant chain, how sure can one be of a server's sexual orientation? Is it like: "Hi! Welcome to TGI Pancho's! My name is Lisa, and I'll be your server today! Why don't you take a minute to look over the menu while I go over there and eat out my girlfriend, and I'll come back and tell you about today's specials?" 

2) If we presume that it is ok (it is not) to punish the gays economically, wouldn't the thing to do be to ask to be moved to a different section with a heterosexual server? Instead of having filthy gays handle your plates of crab rangoon, etc? Or are these Christian stiffs all "hey! our server is a catamite, we walk out of here with 18% of the check total still in our pockets, because we do not have to tip depraved sinners. Cha- CHING!" Really? 

3) In at least one case, the server was an ex-Marine. Just saying. 

The Cod's initial reaction when I saw this story was "people who voluntarily eat in fast casual Italian restaurants, not to mention "Asian bistros," feel that they have a leg to stand on when it comes to disapproving the lifestyles of others? Surprisingly though, the Italian place, Carrabba's, on paper at least, seems to  be fairly cromulent. No mention of unlimited breadsticks, and mostly recognizably Italian items on the menu. I doubt it would give Del Posto much to worry about, but it looks like it would be a better look than say, PF Chang's in an emergency. Also, out of curiosity, I took a look at the diversity tab on the website, and it appears to be an actually more thoughtful and more inclusive statement thann I would imagine: 

Our feelings are even more passionate about our people. We call them Carrabbamicos which is our name for the family members of cooks, service people, management and owners. We see their various cultures and heritages as the seasoning and spices that make our Micos exceptional contributors to our present and future success.

We equate differences with quality. We know our best planning comes from the extraordinary contributions of both women and men when they know their various viewpoints and perspectives are being appreciated and valued. Encouraging inclusive behaviors promotes acceptance over tolerance, sharing over self-interest and our desired feeling of family pride and dedication.

A little bit of HR speak sneaks in, but it seems to reflect something the president of the restaurant chain actually believes, and they did hire the waiter in the first place.