"If they say there's zero tolerance, then there's zero tolerance", Wood told BBC Radio 4's Today programme.
The match between England and Bulgaria was halted after racist chants from a section of the Buglarian crowd. "It's not serious to concentrate on that if there's a qualifier like this and we're playing against a team like England", he said.
The first pause came in the 28th minute when a stadium announcement condemned the abuse and indicated the referee may have to suspend the match.
Bulgaria coach Krasimir Balakov said he did not hear anything as he was focusing on the match.
He tweeted his condemnation of the behaviour of some of the fans, saying it was "unacceptable" that Bulgaria, which he described as "one of the most tolerant countries in the world", should be associated with racism.
"I have heard absolutely nothing (during the game)".
"The first step is if you hear any racist or discriminatory chanting, that you inform the referee, who informs the fourth official".
"We were very clear that if there was anything at the beginning of the second half we would have walked straight off and frankly I don't think we would have gone back", he said.
The match was twice halted by the referee after abuse of the visiting players.
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This is "not the first time" their players have experienced this kind of racist abuse during a game and they will be requesting an urgent investigation from UEFA. "We will be asking UEFA to investigate as a matter of urgency".
Racism was a major talking point ahead of the game, with England striker Tammy Abraham indicating last week that the players could act as a group and leave the pitch if subjected to abuse.
The first half saw two stoppages of play under UEFA protocol for handling racist abuse from the crowd, with England defender Tyrone Mings and other players reportedly the subject of racist chants from the crowd.
Bulgaria supporters were also caught on camera doing Nazi salutes.
Step one of the three-step protocol involves a message played over the PA system, with step two seeing the referee take the teams off the pitch for a period of time.
The Fare network had observers inside the Levski Stadium in Sofia who fed their information to UEFA delegates, and this along with television footage will form part of the evidence European football's governing body uses when making decisions on any sanctions.
"I would like to see a very stringent review by UEFA because I know they take racism very seriously", English FA chairman Greg Clarke said after the game.