In my personal experience, learning Dutch as foreigner can only happen by a method akin to being pushed into the deep end of a wimming pool and learning to swim - in other words, you have to be in a situation were your only option is to know how to speak Dutch - and I say this as somebody who can speak 7 languages (though 2 of them are at a "just getting away with it" level).

That said, most Dutch speak excellent English and even the State (not the local but the central one) and the Banks will communicate with you in English if you want, so people can live in The Netherlands for decades without speaking Dutch (some of my Brit colleagues when I lived over there were like that).

The Netherlands is certainly a far safer place for a lesbian teenager than Britain and will remain so simply because seeing an sexual orientations as absolutely normal happens at the level of Dutch Society itself, to the point that their first large Far Right party was led by a guy who from the start openly admitted to being a homosexual.

Having also lived in Britain I would say they're "complicated" when it comes to tolerance because unlike the Dutch, Brits are big on appearances and judging people, so tolerance its not a natural part of the social posture over there IMHO, whilst gedogen is something the Dutch are actually proud of.