As with anywhere you work, you will not get alone with everyone you met, same as in the school, there are bound to be someone you dislike on first sight. As a matter of fact there are bound to be clashes when two human meet.
Once awhile you will meet people whom you work with who just don't like you, for no reason. Its just part and puzzle of life. If one can't take that fact it will not be possible for her to be working in an environment where interaction with fellow human is necessary. She is more suitable to be working in an environment where minimum interaction with people is require.
To come back crying after every flight just mean that there is really something wrong with that individual, either in her work performance, attitude or her character (very sensitive and weak). From my experience these are usually the 3 main reasons when you see stewardess crying. Of course you might get to meet those nasty one who are all out to pick on you once awhile (meeting them is like striking the Lottery, so don't have to worry to much)but not everyone cry after flying with them, you have to be strong, know your work and your rights, take things positively, then they too can't be unreasonable to you.
Others experiences in the job does not mean what you will experiences it too. There are people who kill themselves in the Army but I went through mine and enjoyed it

No one job is suitable for everyone, you must know yourself, what are you
made up of. If you misses home or feel lonely easily, of course you can't work in a job that require you to be away often.
