Friend was okay with me being LGBT, but had a problem with the WAY I came out... how do I react?

Some backstory, I came out a few months ago on Facebook on Coming Out Day after being closeted for three years. I decided to do it on Facebook because for three years, it was eating me alive and since I was finally able to get to the point of acceptance within myself, I needed to rip off the bandaid and putting it out there on Facebook seemed like the best way for it to be a) immediately known, b) out in public, and I absolutely felt liberated afterwards. So, fast forward a few months, I mention it on Facebook again in passing. A good friend of mine (though we now don't speak anymore) and I grabbed coffee at the local cafe after having a falling out to see where our friendship was at. During this conversation, this friend brought up the Facebook post and said they were happy for me, but that they were very offended that I didn't tell them in person and that they had to find out through Facebook. They took it incredibly personally, as if it said something about the status of our friendship at the time. Their comment to me took me by surprise and I didn't and still don't know how to react to that. The thing is, I can see why this might be upsetting, but my coming out was not about them. Coming out it this manner was the best way for me to do it after putting a lot of thought into it. Additionally, the only people I actually had told in person were other LGBT friends first so that I could have someone to relate to in this coming out process, then I came out to my partner at the time, and then my family, and then I put it on Facebook - all over a two year span. I had also mentioned it in passing before to this friend specifically and they had also liked the original coming out post on Facebook months before the current one where they "found out". Plus, another friend in our circle came out on Facebook a few months before I did, and the original friend commented on the post itself and had nothing but positive and supportive things to say, so I'm not really sure why their reaction to my coming out was different - so different in fact that the coffee shop conversation was the last tangible conversation we had and it was two months ago. Since then, this original friend has posted pictures with Pride Rainbows on Instagram with the caption #Ally, which now seems incredibly two-faced, and I just can't help but feel hurt by all of this. I have inside info that this friend is most likely closeted themselves, if that has any relevance in this, but they've never talked to me about it directly. How am I supposed to react to this? How would you react or what would you do if you were in my shoes? I honestly have no idea as I've been trying to process my feelings for a while now, both with their reaction and the loss of the friendship.