I thought for the most part everyone worked as a team and got along with each other.
We are a team... and the sooner everyone gets their heads out of their *** they will be better off. However, some folks have a case of being unable to remove their head from their ***... This presents challenges and has detrimental effects on team dynamics. That being said, most of us know the real deal. EMS is a team from IFT BLS EMTs to ER doctors. Don't let anyone tell you otherwise. The Fire Dept is the Fire Dept, they are hopped up on "we're the best" kool-aid that they are given in training- some are worse than others as there will always be *******s. That wears off of a lot of them, some it doesn't. Burn out paramedic are hopped up on the salty drink known as hater-aid, and will gripe because they didn't go the Fire route for one reason or another - some are worse than others again because there will always be *******s.
The fact is, most of the issues between Fire and EMS are all because of someone's feels. It is usually a personal gripe. Departmental and agency gripes happen also, and although it shouldn't trickle down to field level folks, it sometimes does.
Overall, I have found that there are good working relationships with most of the departments I have worked with. There are always bad apples, but overall, it has been good. It also depends on you. If you're a snowflake or take things extremely personal, then you're going to have a bad time. We sometimes just need to let things roll off our shoulder more than we do (as humans, not EMS).
Others, have stated, this is a regional issue as well, and it depends on where you work.
I do not want you to be discouraged. If this what you want then go for it. People talk. People gripe. Some people can't get along. It is what it is, life. Just reach your goals, and do your job the best you can. You will find that your attitude will directly reflect on the experience you have; keep a good one. This doesn't mean you won't have bad days, for we all have those at one time or another.