Thats how yuri is treated in general when its only sprinkled around a random series, except this one its a long-running joke. (Was a reason of why I never actually got interested in yuri, thought it was all the same to that or stuff like Strawberry Panic, which is set in a fantasy world of lesbians and superficial and forced relationships and stupid melodrama)
Kinda ranted there for a sec, sorry :p