As someone who has logged many an hour on a bar stool at One Love, I can assure you that any time the ladies there have been rude or ignored someone (at least in my presence), it is because the customer came up and didn't have any sort of greeting other than "I want", rather than a "hey, how's it going". Once that tone is set, you're likely to get a cold shoulder no matter how "super friendly" you try to be.

One Love is one of the most laid-back places on the planet and has a huge following of regulars. As for their non-existent evening business, they don't attempt to draw an evening crowd. They do dinners by request, if you reserve early enough in the day (so they can have staff on hand to cook and serve) but dinner is not their main business.