Thai House Cuisine

We rush to this restaurant after a meeting I had because my sister wanted to try the place out before placing a big catering order for her workplace. So we walk in 45 minutes before the restuarant closes and end up being the only people there. The funny thing is our waitress was almost perfect, she memorized our drinks and orders perfectly without writing it down. The food was great and came out quite fast too. She brought the tab way early, they turned off a few lights, and they turned off the music which was fine as we respected they wanted to get everything done asap since we were the only ones left. We ate as quickly as we could even though we were trying to celebrate our friend getting a new job while also trying it out for my sister's sake (figured we could kill two birds with one stone). Anyways, things go great, we split the check two ways even though we had four people but we were sisters and there was the friend who got the new job. Our friend wanted to pay at least something so my eldest sister tells him he can leave tip but I had already written tip down on my receipt while my other sister who was paying the other half put down $0 for tip. Our friend puts down $5 in cash on the table. We ended up giving almost $10 worth of tip (i just made mine equal to an even number) before making our way to the exit. My sister begins walking towards the waitress to ask her about catering and I'm halfway through the door. The waitress actually meets my sister at the door and we think shes about to say "have a goodnight" or "thank you" and instead, she surprisingly says, "tell that girl if she's not going to leave tip, don't come back and eat here no more" to my sister about me (she mistakened my sister's card for mine because I was the one who left the tip). Shes basically glaring and barely meeting our eyes. Shocked, ALL of us turns to look at her and ask her "what?" She repeats herself and we are beyond shocked at how rude she is and how she's ruined the night. Our friend points to the table and says, "the tip is right there on the table" and all she replies is "oh". Not even a single apology. My sister screws the catering and My eldest sister exclaims that we are never coming back the moment we are out the door. This is was the rudest customer service we've ever seen. First off, people are NOT required to leave tip. Second, we actually DID leave tip. Third, for her mistake, dont be expecting any catering order. Never going back again.