Inconsiderate people

For some reason people are so against others posting photos and such about Father's Day and Mother's Day. They say things such as "why post it on social media when you can say it in person". Today I had someone write that on my photo of my dad. 
I then sat and cried for an hour because I don't have the option of telling my dad how much I love him and appreciate him. I told the person I would not be able to see him and they told me to call him or something. 
Yes, let me just call up to heaven. 
People are so inconsiderate, I get many people may not know but at the same time don't people stop to think that maybe it's a possibility.