and what if someone says your full of crap, is that rude or just an opinion?
It only matters if you let it matter. I work with people subject to verbal and emotional abuse and I often tell them a "modern" non-religious version of this sutta:
Here - the Buddha experienced verbal abuse and this is how he handled it:
SN 7.2 Akkosa Sutta: Insult
Once the Blessed One was staying at Rajagaha in the Bamboo Grove near the Squirrels' Feeding Place. Now the brahman Akkosa Bharadvaja heard this: "The brahman Bharadvaja, it seems, has become a monk under the Great Monk Gotama."
Angry and unhappy, he went to where the Blessed One was. Having approached the Blessed One, he abused and criticized the Blessed One in foul and harsh words.
Thus reviled, the Blessed One spoke to the brahman Akkosa Bharadvaja: 'Well, brahman, do friends, confidants, relatives, kinsmen and guests visit you?"
"Yes, Gotama, sometimes friends, confidants, relatives, kinsmen and guests do visit me."
"Well, brahman, do you not offer them snacks or food or tidbits?"
"Yes, Gotama, sometimes I do offer them snacks or food or tidbits."
"But if, brahman, they do not accept it, who gets it?"
"If Gotama, they do not accept it, I get it back."
"Even so, brahman, you are abusing us who do not abuse, you are angry with us who do not get angry, you are quarreling with us who do not quarrel. All this of yours we don't accept. You alone, brahman, get it back; all this, brahman, belongs to you.
"When, brahman, one abuses back when abused, repays anger in kind, and quarrels back when quarreled with, this is called, brahman, associating with each other and exchanging mutually. This association and mutual exchange we do not engage in. Therefore you alone, brahman, get it back; all this, brahman, belongs to you."
http://www.accesstoinsight.org/tipitaka ... .budd.html