Any doctrine that causes harm is a source of irritation
Blood doctrine - which changes over time but is enforced without mercy. Families who would rather see their loved ones die than risk the consequences of receiving life saving medication.
Shunning - Unloving, unchristian, cruely applied with no empathy. When people are disfellowshipped in order to be made an example of and the inbalance and lack of equity so that elders children are forgiven but others are punnished is disgusting.
2 witness rule and protection of the reputation of the religion over protection of the flock is a stench and a disgusting practice.
Social isolation so that children grow up awkward and with low self esteem is a travesty. The denial of education, the denial of people being allowed to grow and be the best they can be is painful to watch. Isolation from peers so that these children are socially awkward and don't understand how to protect themselves or interact around others. This means that they associate only with other social misfits and also feel pressured to rush into marriage, leading to long term misery. This also means that the literature produced by the society is a joke since the membership is left with only a basic understanding of research and accepts everything however poorly researched.
Insistance that the current doctrine is the truth even when that doctrine is constantly changing. People do not keep up with the changes, most are ignorant of the current beliefs and yet will not research what the believe when challenged. Happy to be ignorant and contemptuous of everyone else even when they are obviously wrong. Leads to arrogance that is underseved and unjustified.
I am all angry now need a cup of tea to calm down and some soft music.