If we read the Tanakh, we see high levels of exclusivism amongst the Israelites which was driven by the idea of them being God's chosen people. I know that there are many Jews today who aren't this way. But I know of quite a few religiously jewish families who aren't welcoming of outsiders into their families and gay people in their families etc.
In every religious group (or political group, or other ideology) you always have a range of people, going from the very very good, through the mediocre, to the very, very bad. It is unfortunately a very human trait to divide the world into us and them, with us being super spectacular, and them being awful and dangerous.
It should therefore not surprise you then that are there are a minority of Jews who are unwelcoming to others. This tends to occur more often within ultra orthodoxy, which is highly insular, full of people worried that exposure to others is a corruptive influence. But if you want to talk about the top of the bell shaped curve, Jews in general are nothing like that.
As for as LGBT goes, most synagogues in the US are quite welcoming. The last synagogue I was a member of, the rabbi was a lesbian. Even the Orthodox shuls I've been a part of have mostly been "Come, but don't flaunt it."
It's the old, "two Jews, three opinions" thing. Even among religious Jews, there is seldom a consensus. Some things are more common than other things, but nothing is universal.