I think that you can still edit your own post.
Click the pencil-icon in the lower left corner of your post,
looks like this if you have that option:
The ability to Edit your own posts within 24 hours should be available to you:
I’m referring to this. It’s not a post. It’s the part where you select emoticons on other people’s posts. You can’t de-select it once you chosen it.
Aha!
I see what you mean. Don’t worry about it 
Which News item was it?
I tested the first News item I could find and there was no way to take back my first response
BUT I could add another to “even out the score” so I think you should be able to select
one of the more positive icons.
The coffee cup isn’t a pure negative, it just says ‘Not my cup of tea’ as in ‘not interested’
There are others that are more negative …
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Yes I remember him as really the only one who seemed to be so combative Or overly argumentative but never showed work. He was obnoxious as well, with me on one occasion but I ignored it and never interacted with him again. As for emojis? I don’t see what the big deal is with them. I almost never use them either here or outside this site.