I understand that bearing a customer who is already a nuisance can be a bit difficult, but every business person must learn both patience and tolerance so that he/she can handle them well.
Entiendo que soportar a un cliente que ya es una molestia puede ser un poco difícil, pero cada persona de negocios debe aprender tanto a tener paciencia como a tolerar para poder tratarlos bien.
Yeah, that's correct. In what ever we do we must be very patient enough because a lot will make us annoyed, but we shouldn't get annoyed.