Not true at all: 1) more intelligent people are happier (author of the blogpost cherrypicked 2 studies, one of which in fact showed that iq is positively correlated with hapiness. 2) IQ negatively correlates with neuroticism. 3) In fact IQ correlates positively with almost every positive facet of human experience - https://www.pnas.org/doi/10.1073/pnas.2212794120

Being on the tail can make you feel very alone. Especially as a child you can end up having only sparse, if any, access to anyone that can meet you in conversation. If you happen to be adopted then you can be alone in your family too. In some cases they are not only unmet but ostracized, vilified, or attacked for being "weird", able to see things that make people uncomfortable, or ask questions that break people's ways of thinking and unintentionally leaving them adrift. Teachers and other adults that are responsible for fostering your success commonly cheer your failures, root against you, and sabotage your efforts. Because everything must be so good for you, you don't need support and can be safely ignored. Over time you become a target for control and manipulation by people that believe your agency is their disadvantage and will use violence, subterfuge, and social arrangement to subdue you.

There are many benefits but it can be a real liability.

One thing I really love about that is that since correlation goes both ways, a happy non neurotic person is more likely to solve puzzles, which seems stupidly obvious in hindsight.