I think the man goal of being true to self is to be the authentic you ; be true to yourself. A goal for being a guru is to live a peaceful life. If you are consistently getting in conflict with others then you are living a peaceful life.
There are only 5 emojis to choose from but you don’t ‘have’ to choose any of them. Like you say, it’s not essential to have to respond. You respond if you ‘want’ to. I don’t believe the emojis are there strictly to impress others. I think they are there so you can express yourself without having to say anything. For instance, I have a thread about going for walks. There’s not really a lot to comment on especially if you aren’t a walker. I, personally, don’t expect a lot of likes from others. I continue to post on it because I enjoy keeping tract of my walks.
Being true to yourself is about being your authentic self. If you don’t enjoy ‘liking’ other people posts, then don’t use the like buttons.
To me, the like button is there to let others know you read there post but didn’t find it necessary to say anything. If somebody had a bad day, adding an unhappy face

is letting them know you read there post and feel for them.
To be truthful, I didn’t really think you used the like button all that much. If using the like button doesn’t work for you, then by all means, don’t use it. I personally use it. The reason I use it is to let the person know I read there post. That’s it. Sometimes I don’t have anything to say. Sometimes I’ll read a post and think it’s a great post so I’ll like the post AND add ‘great post.’
The emojis are there is help us empress ourselves. Sometimes the emojis don’t fit the mood. If a member loses a partner a smiling hug emoji doesn’t quite ‘cut it,’ but most members understand that. I also wish there were ‘more’ emojis.
Anyway, I support your choice to not use emojis. I’m sure you can be yourself without using them.
Note: I think getting along with others isn’t about having others ‘like’ you. I think getting along with others is about maintaining a level of peacefulness.