Hi lilacwoman,
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Unfortunately, you seem to have fallen into the trap of thinking that the actions these people partake in during their daily lives have anything to do with being LGBT.
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Being LGBT is not a "lifestyle choice." People don't choose to be attracted to the same sex, just as people don't choose to be attracted to the opposite sex. They just are. Trans people don't choose to feel out of place in their own bodies. They just do. Many fight being LGBT when they first discover it, and often for many years after, because it means being different, and society isn't particularly accepting of difference.
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Now...as to your coworkers:
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I don't know what business you're in, but from my own experience, what you're describing is not uncommon of *ALL* people whether they be straight or LGBT. I had a manager that commonly took long 2 hour lunches and saw it as a time to socialize with her closest girlfriend. I've known several young professionals who claim to have a close relationship with someone of the opposite sex, but when they go out of town on a business trip, the SO is 'out of state, out of mind' as it were. I've found it common for younger individuals to view conferences and business trips as also a time to party and be with friends...and this is strictly among heterosexuals. Immaturity is a lifestyle choice. However, immaturity is not guaranteed in any set of the population. Stereotyping the entire LGBT population based on the narrow experiences you've had with a subset of that population is rather poor professional practice.
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Now, in my opinion, what you and your boss choose to support is entirely irrelevant here. Business decisions need to be made with the best interests of that business in mind. Though, if you think that supporting LGBT means supporting immaturity and unprofessionalism though...it doesn't. If an LGBT person displays those negative behaviors on the job, they should be disciplined accordingly just as any hetero individual would be. Though, a word of caution here: There is a difference between a person's professional life, and their private life. I know a few people who party hard when off work, but are all business when at work. If you're basing your professional decisions on the personal not-at-work lives of a certain set of people, I'd say that 's extremely unprofessional of you...unless of course those immature actions spill over into the work world...in which case, they should be dealt with accordingly...not based on an entire group...but based upon the specific offending individual involved.