First thoughts = Gay.
No offence to anyone intended.
Even with the words "No offence to anyone intended", that's no defence - some folks would still find it offensive.
I suspect your remark is more likely as a result of naivety on your part as I am aware the term 'gay' is often used in school playground banter to describe someone/something as lame, weak, epic fail etc without really realising the true meaning of that word.
Mr Clarkson from BBC's Top Gear also once got into trouble for calling a rubbish car 'gay'.