Oh, no, it's all basically the same. The declining influence and popularity of The Church and rising cultural homogenization thanks to the worldwide hollywood lobby will soon make all the major holidays into events of Togetherness, that may be taken part of by any persons regardless of religion, culture, sex, color, gender, region, sexual preference, or income class, that will be perpetuated ad infinitum by the production industry to peddle goods via the advertising mass media before a regular period of a freak consumption activity spike.
So bad jokes aside: It's a former catholic holiday that spread from the anglican west due to the entertainment industry and surplanted the native variations where ones formerly existed, often by just altering the date to match VD, or rooted themselves as a distinct imported holiday.
Yes, others, people who don't have the other(s) often become pissy during togetherness periods. It's not like unintentional or oblivious emotional harassment based on social bonds, or the lack of them, is anything new.