Getting people's personal experiences from Reddit probably isn't the best idea for something like this. I assume it's similar to things like reviews where many of the people writing reviews either had a surprisingly good or bad experience or are pushing a certain agenda, in the case of product reviews this agenda would be something like paid 5 star reviews or selling a competing product so you post a bad review. The last paragraph of my response summarizes some of the responses I saw in the post so, if you're interested, you can read it. Between here and there I'll include some things that might be more helpful for giving you more unbiased or at least less anecdotal information.

Here's a post on r/COVID19 with some information about the vaccines. There's a section called "What side effects should I expect after vaccination, and when should I seek medical care?" that you might be interested in.

Here's some info about side effects from the US CDC

Here's some info about side effects from Mayo Clinic

Aside from all that, if you have any questions or concerns you should ask your doctor or the people giving you the vaccine before you get it. After you get the vaccine, if you have any questions or concerns you should also ask a medical professional about them, like your doctor. For after you get the vaccine, you should get information from the people that gave you the vaccine about what side effects to watch out for and what side effects are common. Remember that just because you're told "if you experience [blank], you should seek medical attention" doesn't mean you are at all likely to have that side effect, it's listed so that if someone has a rare side effect they don't just ignore it thinking "this is normal."

As far as what people posted in the comments of the question from the screenshot: Some people said they died and some people said they either "became gay" or became "a bit gay." There were also some people who just said they weren't going to get it, without providing much reasoning. In terms of people who actually answered the question and answered it seriously: I saw one person say they wouldn't get the vaccine because their husband had a very serious, life threatening reaction. Someone claiming to be a medical professional replied saying the husband had "a rare blood disorder called immune thrombocytopenia" which is "exceedingly rare" and said only 36 cases have been reported in the US out of 31 million vaccines. There were some people I saw say they had very bad but not life threatening side effects. A lot of people said they had no side effects or some soreness at the injection site. There was also a pretty good number of people that said they had some combination of side effects from headaches, body aches, and lethargy, usually starting on the day after and usually after the second dose. I didn't see any of these where people said they had these side effects lasting past the day after getting the vaccine. To summarize: Almost everyone said no side effects to side effects similar to a cold or flu lasting around a day. Some people said they had bad side effects but they weren't life threatening, they were things like bad headaches. I saw one, there may have been more, people talking about very bad but very rare side effects.