Kyo sums it up very well.
You really have no way of knowing how the people you surround yourself with (family/friends) will react unless you tell them or they outright say "That's fine" or "That's no okay". So yeah, I lie a lot. I shouldn't have to, nobody should. Nobody should have to live in fear of how their loved ones will take to them.
And as for relating to the issue even if you're straight: it's fine if the importance is hard to grasp. Just know that it's an important event for some people. The "It's irrelevant to me so I it's not important" or "I disagree" mentalities aren't helping anything. No one is punishing you for having an opinion, rather having one beget from inconsideration. You won't be able to see from our exact viewpoint but considering this is something that people like me have been hoping for and struggling for would be enough. If not, most of us can relate to having a crush, falling in love, wanting to be with a significant other, wanting a relationship like other have, etc etc. Love is not rigidly defined. If we cage it to a singular case then we limit it and it loses it's value. So it isn't for one, or even many people to decide what love or a relationship is, but we can all feel whether or not it's there.
I don't want to force anybody's opinion to change. I just ask that you look a little deeper: get a different perspective. Consider some things and put yourself in another persons place. And if your opinion is the same, you can be sure that it's an honest opinion born from consideration and research.