That doesn't sound like a terribly hostile tone. Yes, there was a little bit of hostility, but nowhere near the level that would lead a support person to give up on helping you.

Remember, people in support are used to a somewhat hostile tone. People get in touch when something is wrong, and so it's fairly common for people to be frustrated. If they just responded with "sorry, can't help you" to every support query with a slightly hostile tone, they wouldn't be providing much support.

And yes, it is also good to try and assume good faith and not vent your frustration at a support person who had nothing to do with whatever issue it is that you're frustrated about. But it's a fact of life in support that you'll have to deal with some unhappy people, so you need to be able to deal with it.