I have not seen a trader that do not lose sometimes, i may be new to the forum but been learning before now. it has nothing to do with sentiments but traders have to learn to accept trades the way it is, without attributing loss to any factors; as it leads to more rekts.
Always accept the market as it is without blaming any factors.
Always dyor too
Well if you follow the rule that you only invest what you can afford to lose, you are not going to blame anyone, you will be ok if you lose or if you win, people blaming the market are those who put their savings and their retirement pay and treat it as an investment of a lifetime, which is the case and sometimes it's not.