Try the following:

Eat Me Art Restaurant on Soi Pipat just off Thanon Convent. Gay owned and operated, food is kinda Asian/European fusion but well prepared and very well presented. Price Moderate

Bussaracum Royal Thai Cuisine on Pan Road between Silom and Sathorn. Roya Thai Cuisine that is beautifully prepared, designed and presented. Should not be missed in order to experience Haute Thai cuisine. Expensive for Thai food but moderate overall price. Not gay affiliated (that I am aware of :-) )

The new Cafe Laos on Silom Soi 19, again between Silom and Sathorn Roads for beautiful colonial house atmosphere and excellent selection of Issan (Lao) food that again is well prepared. Moderate to expensive for Thai food but the ambience is excellent.

Just a few to try