In act 1, scene 1, Benvolio's instinct is to withdraw from a potentially eruptive confrontation with the volatile Tybalt. Benvolio is a generally reasonable character, wary and guarded by nature, hence the meaning of his name ("goodwill"). He is the admirable peacekeeper, or diplomatic figure, in the street brawl. It is not unreasonable, therefore, to conclude that he cannot fondly approve of his polar opposite, Tybalt. Tybalt's propensity to ignite a "motiveless" feud is clear in this scene as he implores Benvolio to "look upon thy death." His actions are not laudable, yet Benvolio is discreet in his response:

Put up thy sword,
Or manage it to part these men with me. (ll. 63–4)

Benvolio speaks in stiff imperatives. Thus, we have sound reason to sense his objection to the man who bitterly seeks his death. In effect, Shakespeare makes his audience aware of the visceral tension between the Montagues and Capulets through the foils Benvolio and Tybalt. Benvolio is, at last, induced to challenge (or defend himself from) his foe. The stage direction "[They fight]" evidently describes Benvolio's displeasure and Tybalt's excitable contempt.

In Act1, scene 1 of "Romeo and Juliet", Benvolio does reveal some of his feelings about Tybalt nad Tybalt reveals some of his feelings about Benvolio and of course since Tybalt is a Capulet they are not positive feelings.  Benvolio comes out to break up the fight saying,

"I do but keep the peace. Put up thy sword,
Or manage it to part these men with me."

This is in response to Tybalt telling Benvolio that he is about to kill him.  This does tell us a few things -- Benvolio does not have a very high opinion of Tybalt and his need to constantly fight.  It also tells the reader that Tybalt would very much like to murder Benvolio because he is of the house of Montague.  Tybalt continues by saying,

"What, drawn, and talk of peace? I hate the word
As I hate hell, all Montagues, and thee. 
Have at thee, coward" (l. 65-67)

Tybalt is calling Benvolio a hypocrite because he wants peace but takes out his sword and that he is ready and willing to fight Benvolio to the death.